WA-List » Wahkiakum County

Wahkiakum County


  • Name origin: Name derives from that of the tribe whose name means “big trees.”
  • Established: 1854 Apr 25
  • County seat: Cathlamet
  • County government website
  • Upcoming events (via WA-List’s events calendar)
  • Population (2010): 3,978 (Rank: 38 of 39)
  • Area (2010): 263.38 square miles (Rank: 37 of 39)
  • Density (2010): 15.1 people per square miles (Rank: 30 of 39)
  • Highest elevation: 2,673 feet, Huckleberry Ridge.


Cities and Towns Population Area Density Elevation Zip code
(sq miles) (pop/sq miles) (feet)
1. Cathlamet town 532 0.49 1,085.7 340 98612


Additional facts

  • Wahkiakum County is one of six Washington counties with only one incorporated city.
  • Wahkiakum is the 2nd smallest county by population, and the 3rd smallest by land area.
  • Cathlament has the smallest population of any county seat in the state.


  • This page is updated periodically in an effort to keep information accurate and offer additional data.
  • = link to map
  • All population and area data are from the 2010 United States Census. All population density figures for cities greater than 5,000 people are as well. Densities of smaller towns and cities were calculated separately using US Census data.